There are a couple probably cuprits of this issue...
1. The armature of the float is bent or otherwise unable to move completely to the top to the tank. Remove the sending unit and physically move the arm to the full top position and note the gauge reading. If it reads to full or higher, clean the unit in solvent (carb cleaner.)
2. The float unit has been penetrated and has taken in some fuel. This happens over the years and Fords are notorious for this. Replace the float in the tank.
3. Bad ground at the sending unit. The sending units reads from resistance in the wiring. A ground or poor connection (like a quick connect in the line) will cause a poor reading.
4. Instrument Cluster voltage regulator. There is a voltage regulator for the instrument cluster on the back of the cluster assembly. The gauge run off this separate regulator and it goes fautly over time. Replace this unit. You can find replacements as some online NOS parts supplies and often times they are listed on EBAY for sale.
Best of luck!
-Jeff Medved
Silver Spring, Maryland
1967 Ford Thunderbird Landau
__________________
-Jeff Medved
Las Vegas, Nevada
1967 Ford Thunderbird Landau
|